CHINESE JOURNAL OF CATALYSIS
·
2016
·
IF 2.628
Qi Sun,Xianglan Xu,Honggen Peng,Xiuzhong Fang,Wenming Liu,Jiawei Ying,Fan Yu,Xiang Wang
A series of SnO 2 -based catalysts modified by Mn, Zr, Ti and Pb oxides with a Sn/M (M = Mn, Zr, Ti and Pb) molar ratio of 9/1 were prepared by a co-precipitation method and used for CH 4 and CO oxidation . The Mn 3+ , Zr 4+ , Ti 4+ and Pb 4+ cations are incorporated into the lattice of tetragonal rutile SnO 2 to form a solid solution structure. As a consequence, the surface area and thermal stability of the catalysts are improved. Moreover, the oxygen species of the modified catalysts become easier to be reduced. Therefore, the oxidation activity over the catalysts was improved, except for the one modified by Pb oxide. Manganese oxide demonstrates the best promotional effects for SnO 2 . Using an X-ray diffraction extrapolation method, the lattice capacity of SnO 2 for Mn 2 O 3 was 0.135 g Mn 2 O 3 /g SnO 2 , which indicates that to form stable solid solution, only 21% Sn 4+ cations in the lattice can be maximally replaced by Mn 3+ . If the amount of Mn 3+ cations is over the capacity, Mn 2 O 3 will be formed, which is not favorable for the activity of the catalysts. The Sn rich samples with only Sn-Mn solid solution phase show higher activity than the ones with excess Mn 2 O 3 species.
研究领域:
催化
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材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yaodan Zhang,Yuanchao Xie,Hongtao Wang,Dan Han,Shengbo Sang
It is essential to improve the detection response and maintain good stability of the gas sensor to be able to effectively monitor the ppb level harmful NO 2 gas. This work was dedicated to improving the sensing performance of NO 2 gas sensors by synthesizing flower-like structure SnO 2 /GaN composites using a combination of solvothermal and ultrasonic mixing method. The introduction of GaN increased the specific surface area of SnO 2 and provided more adsorption sites. Gas-sensitive test results showed that the SnO 2 /GaN composites exhibited excellent NO 2 response (42–1 ppm of NO 2 ) and lower detection limit (100 ppb) at lower operation temperature of 130 °C. In addition, the fluctuation in the initial resistance and response of the SnO 2 /GaN composites to 20 ppm of NO 2 within one month were small. The improved sensing performance was attributed to the unique flower-like structure of SnO 2 , the excellent thermodynamic stability of GaN and the heterogeneous interface of SnO 2 /GaN. This work provides a new design strategy for the development of highly sensitive ppb-level NO 2 sensors for atmospheric environmental monitoring.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yingyue Wang,Guojian Zhang,Jinyang Huang,Mengying Long,Dongmin An
In this paper, pure SnO 2 and SnO 2 composite materials (ZSnO 2 ) modified with different amounts of ZIF-67 (20 mg, 60 mg) were synthesized utilizing a simple solvothermal method. The gas sensing performance of these sensitive materials was tested, and the results manifested that at a low operating temperature of 170 ℃, the responses of ZSnO 2 -60 and ZSnO 2 -20–50 ppm triethylamine (TEA) gas reached 142.6 and 83.7, respectively, which was ∼3.81 and ∼2.24 times that of pure SnO 2 (34.7). In addition, both doped samples had lower operating temperature, excellent selectivity and repeatability towards TEA gas. The doping of ZIF-67 led to oxygen vacancies increasing, specific surface area amplifying and p-n heterojunctions forming between Co 3 O 4 and SnO 2 in ZSnO 2 nanocomposites. These synergistic effects enhanced the gas sensitivity of ZSnO 2 nanocomposites to TEA gas.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Express
·
2021
·Vol. 2
·期 2
·020021
·
IF 0
Guoliang Chen,Suyang Lu,Yunfan Shang,Wenwen Zeng,Haoran Zhan,Jun Mei,Zhoukun He
In this work, monophasic Sn3O4 and biphasic Sn3O4-SnO2 heterostructure composed of plentiful nanosheets were synthesized by using a simple one-step solvothermal method. Their morphology, structure, and composition were characterized by XRD, XPS, SEM and TEM. Also their NO2 sensing performance were tested systematacially. The results demonstrated that the gas sensor based on the Sn3O4-SnO2 composites exhibits excellent NO2 sensing performance including low operating temperature, high sensitivity and outstanding selectivity. Its sensitivity to 1 ppm NO2 is as high as 1395.0 ppm−1 while the operating temperature is as low as 50 °C. Its excellent NO2 sensing performance could be attributed to the formation of Sn3O4-SnO2 heterojunction which modulated the electrons effectively, abundant oxygen vacancies and high specific surface area which enhanced the adsorption of NO2.
研究领域:
材料科学
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环境监测
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传感器技术
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Mohsin Ali Marwat,Habib Ullah,Muhammad Usman,Muhammad Ali Ehsan,Haibo Zhang,Muhammad Fawad Khan,Sher Ali,Muhammad Yousaf
Herein, motivated with narrow/wide-bandgap heterojunction materials as one of the perfect solutions, we separately synthesized BiFeO 3 (BFO) and SnO 2 nanoparticles ; then coupled them in various weight percentages to obtain nanocomposites with efficient contacts for visible light 2,4-DCP and RhB degradation and effectively reduced charge recombination. The material of interest, i.e., with six weight percentage coupling of SnO 2 (i.e., 6SO/94BFO), endorsed superior photoactivity for 2,4-DCP and RhB degradation. In addition, under the visible light irradiation, this photocatalyst degraded 87.2% of RhB and 65.1% of 2,4-DCP in 2h, which compared to pristine BiFeO 3 nanoparticles are about 2.6- and 2.7-times enhancements, respectively. The photoluminescence spectroscopy and mechanism model showed a substantial interface between BiFeO 3 and SnO 2 and unfeasible electron-holes recombination. The electrons and holes are entirely utilized to produce superoxides and •OH radicals, respectively, predicting enhanced visible-light photodegradation. Overall, this work offers novel narrow/wide-bandgap heterojunction nanocomposites as feasible aspirants for pollution control and effective visible light photodegradation of chlorinated compounds.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Jinhuan Jiang,Chenyang Shi,Lixin Song,Pinfan Du,Wen Guo,Jie Xiong
Non-radiative recombination due to high-density defects at the bottom of the perovskite layer and in the SnO 2 ETL layer is not favourable for charge transfer. In this work, disodium diphenylsulfone-4,4′-dichloro-3,3′-disulfonate (SDCDPS) was introduced into SnO 2 solution to prepare a high-quality pinhole-free SnO 2 film. The sulfonate of SDCDPS collaborates with diphenylsulfone to passivate uncoordinated Sn 4+ in SnO 2 ETL, which will reduce the work function (W F ) in the SnO 2 , increasing the conduction of SnO 2 film and reducing the charge recombination of pre-buried interface. Besides, the sulfonate and diphenysulfone groups also passivate the uncoordinated Pb 2+ in perovskite to increase the crystallinity of perovskite and reduce non-radiative recombination. After SDCDPS modification, the power conversion efficiency of perovskite solar cells significantly increased from 18.2% to 21.2% with hysteresis factor decreasing from 10.4% to 3.35%. Also, the modified device shows well stability due to the enhancement of perovskite crystallization and the reducing defects. Under relative humidity of ∼60%, the PCE of the unencapsulated device modified by SDCDPS remains at 81% of the initial device after 720h. This work offers a dependable method for enhancing the quality of the buried interface in PSC and to pursue productive and consistent devices.
研究领域:
材料科学
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能源科学
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光电技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Shihang Yan,Zhengrun Chen,Ya Wang,Jieqiang Wang,Hongyan Xu
For NO 2 , a gas that is widely used and harmful, domestic and foreign researchers have done a lot of work to develop a sensor with low detection limit and low humidity sensitivity to achieve efficient detection of NO 2 . In this work, first of all, dense and uniform SnO 2 nanosheets were grown in situ on the surface of Al 2 O 3 ceramic tube by hydrothermal method. Then, the ZIF-8@SnO 2 porous composite gas-sensitive material was constructed by solvent thermal method. With the advantages of the ZIF-8 porous screening framework, the permeation of different gases can be selectively controlled, and the adsorption efficiency of NO 2 gas can be enhanced through the modification of ammonia to improve the selectivity of NO 2 . The results show that the response of the Modified-ZIF-8@SnO 2 sensor is significantly enhanced, and the selectivity is greatly improved at low operating temperature. At 140 °C, the response of Modified-ZIF-8@SnO 2 to 50 ppm NO 2 gas is as high as 61, which is about 18.4 times higher than that of SnO 2 nanosheets and about 16.3 times higher than that of ZIF-8@SnO 2 . Meanwhile, the anti-interference ability of the Modified-ZIF-8@SnO 2 sensor to humidity has been improved. This work provides a new idea for improving the selectivity and humidity insensitivity of gas sensors.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2021
·Vol. 11
·期 39
·2101855
·
IF 29.368
Liang Tan,Xuexia Lan,Jinwei Chen,Hanyin Zhang,Renzong Hu,Min Zhu
Lithium-ion batteries (LIBs) suffer dramatic energy reduction, and are even unable to safely charge below -10 °C, due to sluggish Li + transport kinetics in the anode, electrolyte and solid electrolyte interphase (SEI), as well as large overpotential which causes Li plating on the anode surface. Herein, a SnO 2 -LiF-graphite (SLG) composite anode is developed for wide temperature application. The SLG with a propylene carbonate electrolyte delivers a stable capacity of more than 900 mA h g −1 at 60 °C with 100 mA g −1 , maintaining 823.9 mA h g −1 at -10 °C. When matched with a tetrahydrofuran-based electrolyte, the SLG delivers stable capacities of 780.4 mA h g −1 at -40 °C and 637.2 mA h g −1 at -50 °C, respectively. It is demonstrated that the LiF-induced inorganic-rich SEI maintains the nanostructure of the active Sn, and that their interfaces with the electrolyte are highly stable. Furthermore, the formation of α-Sn with higher Li + diffusion kinetics results in a very small overpotential (≈0.18 V) of lithiation for SLG from 30 °C to -50 °C. This work shows that LiF-modified SnO 2 anodes matched with suitable electrolytes can qualify the LIBs for a safe and long-life at wide temperature, which is helpful to further promote these batteries for low-temperature applications.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 24
·20959-20967
·
IF 2.324
Wu Xiang-Feng,Zhang Chen-Xu,Wang Yu-Duan,Su Jun-Zhang,Zhang Jia-Rui,Feng Yan-Mei,Zhang Mi,Tong Xin,Zhang Wei-Guang,Sun Xiu-Guo
The Ag 2 CrO 4 /SnO 2 n–n type heterojunction has been fabricated by coupling Ag 2 CrO 4 particles with SnO 2 nanorods via an in situ synthetic method. The photocatalytic degradation mechanism of the as-prepared heterojunction has also been discussed. Characterization results revealed that the as-fabricated Ag 2 CrO 4 /SnO 2 composites could reinforce the photo-degradation competencies for rhodamine B dilute solution compared to pure Ag 2 CrO 4 and SnO 2 samples. As the increase in the molar ratios of Ag 2 CrO 4 –SnO 2 , the photocatalytic degradation efficiency appeared to the tendency of first increasing and then decreasing. When it was 4:10, in 90 min, the as-obtained samples possessed the vintage photocatalytic degradation efficiency of 95.8% among of pure SnO 2 , Ag 2 CrO 4 and the as-prepared composites with various molar ratios, respectively. Furthermore, the Ag 2 CrO 4 and SnO 2 were connected via chemical bonds to form the homogenous heterojunction. It could boost the separation and transfer of the photogenerated holes and electrons. In addition, the holes, hydroxyl and superoxide radicals played a major role during the photodegradation process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Shukun Le,Weishan Yang,Gonglai Chen,Aoyu Yan,Xiaojing Wang
The carbon dots (C-dots) mediated Sn 2 Ta 2 O 7 /SnO 2 heterostructures with spongy structure were successfully assembled by simple hydrothermal route. The photocatalytic removal efficiency of amoxicillin (AMX, 20 mg L −1 ) over C-dots/Sn 2 Ta 2 O 7 /SnO 2 was estimated to reach up 88.3% within 120 min simulated solar light irradiating. Meanwhile, the HPLC-MS/MS analysis and density functional theory (DFT) computation were examined to clarify the photo-degradation pathway of AMX. The mechanism investigation proposed that with the modification of C-dots, the photocatalysts improves the utilization of solar energy by harvesting the long wavelength solar light due to their unique up-converted photoluminescence (UCPL). In addition, the porous spongy structure and plenty of tiny C-dots promote the ability of adsorption by enlarged specific surface area. Furthermore, the C-dots mediated Z-type heterojunction of Sn 2 Ta 2 O 7 /SnO 2 facilitates the efficient separation and transfer of photo-induced carriers. Our work affords a promising approach for the design of the high-efficient photocatalysts to remedy poisonous antibiotics in aqueous environment.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zhimin Yang,Yaqing Zhang,Liang Zhao,Teng Fei,Sen Liu,Tong Zhang
The metal oxides-based chemiresitive gas sensors have attracted enormous interest because of their exellent sensing perforamcnes, which have emerged as very promising candidates for gas monitoring. However, from the view of organophosphorus compounds detection, a unique combination of low detection limit and fast respons/recovery rate remains challenging. Herein, the synersgitic effects of oxygen vacancy engineering and surface gold decoration enabling excellent sensing performances for detection of dimethyl methyl phosphonate (DMMP, a typical organophosphorus) is reported. To demonstrate the proof of concept, Au nanoparticles (NPs) decorated oxygen vacancy-enriched SnO 2 hybrids (designated as Au-O-SnO 2 ) were designed as sensing materials, where the O-SnO 2 samples were fabricated by introduction of oxygen vacancies onto commercial SnO 2 through organometallic chemistry-assisted approach using (CH 3 ) 2 SnCl 2 as precursor, followed by deposition of Au NPs by an in-situ reduction routine. After optimizing Au NPs content in hybrids (1 wt%, 3 wt%, 5 wt% and 7 wt%), O-SnO 2 decorated with 5 wt% Au NPs (designated as Au-O-SnO 2 -5) exhibits excellent DMMP sensing performances, such as, an enhanced recoverable response of 1.67 to 680 ppb DMMP, low detection limit of 4.8 ppb, short response time of 26 s and recovery time of 32 s, as well as good selectivity , which are much better than that of commercial SnO 2 (C-SnO 2 ) and O-SnO 2 , and Au NPs decorated C-SnO 2 . Based on the detailed investigation, the enhanced DMMP sensing performances of Au-O-SnO 2 hybrids can be mainly ascribed to the synergistic effect of increasing surface active sites induced by oxygen vacancies, the chemical and electronic sensitization of Au NPs. As a result, Au-O-SnO 2 -5 hybrids display relatively low activation energy of 24.11 kJ/mol for DMMP oxidization, which is lower than that of O-SnO 2 (35.54 kJ/mol). Our results provide a feasible method for boosting sensing performances for DMMP detection, paving new way for fabrication of metal oxides-based gas sensors for rapid detection of trace organic compounds with complexed structures.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Small
·
2017
·Vol. 13
·期 47
·1701993
·
IF 8.643
Yong Cheng,Qian Li,Chunli Wang,Lianshan Sun,Zheng Yi,Limin Wang
Due to the high theoretical capacity as high as 1494 mAh g −1 , SnO 2 is considered as a potential anode material for high-capacity lithium–ion batteries (LIBs). Therefore, the simple but effective method focused on fabrication of SnO 2 is imperative. To meet this, a facile and efficient strategy to fabricate core–shell structured C/SnO 2 hollow spheres by a solvothermal method is reported. Herein, the solid and hollow structure as well as the carbon content can be controlled. Very importantly, high-yield C/SnO 2 spheres can be produced by this method, which suggest potential business applications in LIBs field. Owing to the dual buffer effect of the carbon layer and hollow structures, the core–shell structured C/SnO 2 hollow spheres deliver a high reversible discharge capacity of 1007 mAh g −1 at a current density of 100 mA g −1 after 300 cycles and a superior discharge capacity of 915 mAh g −1 at 500 mA g −1 after 500 cycles. Even at a high current density of 1 and 2 A g −1 , the core–shell structured C/SnO 2 hollow spheres electrode still exhibits excellent discharge capacity in the long life cycles. Consideration of the superior performance and high yield, the core–shell structured C/SnO 2 hollow spheres are of great interest for the next-generation LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）